多项选择题
In Layer 2 topologies， spanning-tree failures can cause loops in the network. These unblocked loops cancause network failures because of excessive traffic. Which two Catalyst 6500 features can be used to limitexcessive traffic during spanning-tree loop conditions？（）
A.loop guard B.storm control C.storm suppression D.broadcast suppression E.BPDU guard
单项选择题 InordertoconfiguretworoutersasanycastRPs，whichoftheserequirements，afaminimum，mustbesatisfied？（）
单项选择题 InPIM-SMwhatcontrolplanesignalingmustamulticastsourceperformbeforeitbeginstosendmulticasttraffictoagroup？（）
多项选择题 Whichofthesestatementsaboutpenultimatehoppoppingaretrue？（）
